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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in regulatory assets and liabilities $ (1,143) $ 2,234
GSWC    
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in regulatory assets and liabilities (2,767) 3,935
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets, contributions by employer 3,400  
Pension Benefits | GSWC    
Defined Benefit Plan Disclosure [Line Items]    
Regulatory adjustment — deferred 800  
Pension Benefits | Water: | GSWC    
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in regulatory assets and liabilities $ (300) $ (100)